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// this function processes the button messages

void process_buttons(void)

{ 

  // find out which buttons were pressed

  u08 tmp = inp(BUTTON_PIN);

  // invert as 0 -> button pressed

  tmp = ~tmp;

  // make sure the button was not pressed before

  u08 cleaned_val = tmp ^ last_button;

  cleaned_val = cleaned_val & tmp;

  // store current val as last val

  last_button = tmp;

  //return if HOLD is active

  if (!(BUTTON_PIN&(1<<BTN_HOLD))) return; 

  // button 2 is pressed -> fast forward

  if (last_button&(1<<BTN_SONG_UP))   

    {

  FAST_FORWARD_ON;

  return;

  }

  FAST_FORWARD_OFF;

  // button 1 was pressed -> song back

  if(cleaned_val&(1<<BTN_SONG_DOWN)) play_prev();

  // button 2 was pressed -> song next

  if(cleaned_val&(1<<BTN_SONG_UP))   play_next();

  // button 3 was pressed -> vol -

  if(cleaned_val&(1<<BTN_VOL_DOWN))  vol_down();

  // button 4 was pressed -> vol +

  if(cleaned_val&(1<<BTN_VOL_UP))    vol_up();

  // button 5 was pressed -> play/stop

  if(cleaned_val&(1<<BTN_PLAY))

    {   

    if (bPause) bPause=false;

    else bPause=true;

    if (bPause) PLAY_LED_ON;

    else PLAY_LED_OFF;

    if(ps.state == IDLE) ps.state = PLAYING_MMC_INIT;  // go to start of file

    }

}

  // button 2 is pressed -> fast forward

  if (get_key_rpt(1<<BTN_SONG_UP)) FAST_FORWARD_ON;

  else FAST_FORWARD_OFF;

  // button 2 was pressed -> song next

  if (get_key_press(1<<BTN_SONG_UP))  play_next();